Well, thanks to help of this thread, I installed my X5 (factory) hitch this evening. I started around 5:30 PM, and finished about 10:00 PM. Granted, I ate dinner, watched some TV, answered e-mails, etc... I could have done it in about 4 hours had I worked straight through. Now, if I help someone next time, I bet it only takes about 2 hours!
My biggest PITA was getting the bumper cover to unsnap from the clips (I wasn't tugging hard enough). My second PITA was getting the wires into the fuse panel. You need to line them up perfectly, and then push them until they "snap" with a thin and narrow screwdriver.
Oh, I apparently left my rivet tool at the track, so I need to get a new one tomorrow. My dealer is going to flash my computer for $100 later this week.
It's not a difficult job, but you need some technical know-how, and some electrical experience.
I'll be towing my Boxster Spec Racer on an open trailer.
Thanks to EVERYONE who posted here!
- Mike